Mine has one and untill yesterday the 4 months ive owned it I never knew I had one lol! But the problem is i didnt know because it doesnt work. I took it out of the center consol and all the wires look in good shape as well as the connector. There is a aftermarket radio that im guessing isnt hooked up to the subwoofer. Does any one have this built in sub and have you had any problems with yours? Thanks!